Internal-combustion engine



P. DOUGAL L.

INTERNAL COMBUSTION ENGINE.

APPLICATION FILED AUG.27, 1920.

Patented July 18, 1922.

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PERCY DOUGALL, or innnnn'iumsrnn, ENGLAND.

n'rnnnan-eoiueus'rion ENGINE.

narrator.

Specification of Letters Patent. PatQllted JillV 18,

Application filed August. 27, 1920. Serial No. 406,267."

.which are governed by the hit-and-miss or similar method, intermittent idle strokes occurring due to the gas, valve not, opening during certainot the suction strokes, above a predetermined speed. H

The object of; the present invention is to preve'ntthe loss of power involved by the compression of the air in the cylinder during the inward strokes preceding thesaid idle strokes, thereby increasing the efficiency of the engine.

According to the invention, a valve in the cylinder (which may be the existing inlet or exhaust valve or an independent valve) is controlled bythe governor, so as to open during the inward strokes preceding the idle outward strokes in order to discharge into the atmosphere the air which is displaced by the piston, without the said air being compressed as usual, thus avoiding the useless absorption of power from the engine. I t

Figure 1 of the accompanying drawings show a sectional elevation of an arrangementconstructed in accordance with this inventioln'for admitting of the release of the air drawn into the cylinder preceding the idle strokes of the piston, the air release valve being shown closed.

Figure 2 is a sectional elevation or the arrangement, showing the air release valve open.

Figure 3 shows more clearly, upona larger scale, the manner in which the'gas valve and air release valve are controlled by the -The same reference numerals indicate corresponding parts in each of the figures.

Reterringrto the drawings, the gas valve is operated by means of a cam 1 geared up lifted and-the gas port opened. The peckerpivoted at 7 to a lived support, the said arm 6 of the lever being connected up withthe governor 8 in sucha manner that when the speed of the engine becomes e'vcessivethe governor 8 raises the said arm oupwards andmoves the pecker-block 3 out of engagement. withthe pecker 2,=so that a miss takes place,. the gas valve remaining closed; To

prevent the air which has beendrawn into the cylinder through the suction operated valve 22 on the last suction ,strokeii rom being compressed during the inward strokes block 3 is carried by a depending 'arm'5 fixed to the end of one, arm 6 of a bell-crank lever preeedingidle strokes of th'elatter and thus resulting i'na .lossvin the eflicieney otthe engine, an air-release valve 9 :is provided which 1automaticallyopens when the gas supply is cut off. 'llhisair-releasevavle 9 is carried by one end of a lever 10 pivoted at about the middle at 11 the opposite end of the lever carrying a tappet-rod 12 working within suitable guides 13. Arranged directly opposite to the end of the tappet-rod 12 is an'operating rod 1 1 working within guides 15 and pivoted to oneend of a lever member 16 whose opposite end is engaged by thecain 1 operating the gas valve. The other arm 17 of the bell crank lever which actuates the pecker-block 3 carries an intermediate member 18 which is adapted to be interposed between the operating rod 14 and the tappet-rod 12 so that the said operating rod engages with the latter through the medium of the intermediate member 18 whichresults in the air release valve being supported by and. free to move longitudi-v nally within a guide 21, as shown in Figure 3 of the drawings. I

When the speed becomes excessive and the arm 6 oithe bell crank levercarrying the pecker block 3 is raised by the governor 8 so that a miss takes place and the gas port is closed, the other arm 17015 the bell crank lever is at the same time movedoutwards,

as shown in Figure 2, and the intermediate member 18 carried by the said arm is interposed between the tappet-rod 12 and the operating rod 1 1 of the air release valve 9, the latterbeing thus operated by the cam 1 so as to allow the air in the cylinder to,

escape into the atmosphere. On the engine speed decreasing the intermediate"member 18 is moved out of engagement with the Y tappet-rod 12 of the air valve 9, as shown in V employed the exhaust valve may serve a similar purpose being operated from the bell crank lever 1n a similar manner.

Havlng fully described my invention,

What I desire to claim and secure by Letters Patent is n 1. In an internal combustlon engine, the

combination with the cylinder, of separate air and gas intake valves, a governor controlling the gas valveso as to cause the latter to remainclosed at excessive speed, an airrelease valve in the cylinder,a cam for operating said air-release valve, and a displaceableintermediate member adapted to complete the operative connection between the cam and air-release valve, said displaceable member being connected to the governor so as automatically to break the connectlon between the cam and air valve" when the gas valve is, operative andtoestablish the said connection When the gas valve is inoperative. 2. ln' an nternal combustion englne, the

combination with the cylinder, of a gas valve a displaceabl'e pecker block for op erating said gas valve, a lever connected to the pecker block, a governor influencing the lever and pecker-block so as to render the gas valve inoperative at high speeds, an airrelease valve in the cylinder, a cam for operating said alr-release valve, and a d1splaceable'intermediate member adapted to complete the operative connection between" the? cam and air-release valve, said displaceable member being connected to the governor influenced lever so as automatically to'break the'connection between the cam and airrelease valve when the gas valve is operative,

and to establishthe said;

connection when the gas vali e is inoperative.

In testimony whereof I have hereunto set 1 my hand in witnesses. V V Y PEROYDOUGALL, f lVitn'ess'es: i c= H. L. SKERR TT;

S. SKERRETT.

presence of two subsci'ribing 

